TY - JOUR
T1 - Biaxial thermal creep of Inconel 617 and Haynes 230 at 850 and 950°C
AU - Tung, Hsiao Ming
AU - Mo, Kun
AU - Stubbins, James F.
N1 - Funding Information:
The work was supported by US Department of Energy under Grants DE-FC07-07ID14819 and DOE NEUP 09-516 . Special thanks are given to Prof. Shang from the University of Illinois for providing valuable discussion of the results of the creep tests. The microstructural analysis was carried out in the Frederick Seitz Materials Research Laboratory Center Facilities, University of Illinois.
PY - 2014/4
Y1 - 2014/4
N2 - The biaxial thermal creep behavior of Inconel 617 and Haynes 230 at 850 and 950°C was investigated. Biaxial stresses were generated using the pressurized tube technique. The detailed creep deformation and fracture mechanism have been studied. Creep curves for both alloys showed that tertiary creep accounts for a greater portion of the materials' life, while secondary creep only accounts for a small portion. Fractographic examinations of the two alloys indicated that nucleation, growth, and coalescence of creep voids are the dominant micro-mechanisms for creep fracture. At 850°C, alloy 230 has better creep resistance than alloy 617. When subjected to the biaxial stress state, the creep rupture life of the two alloys was considerably reduced when compared to the results obtained by uniaxial tensile creep tests. The Monkman-Grant relation proves to be a promising method for estimating the long-term creep life for alloy 617, whereas alloy 230 does not follow the relation. This might be associated with the significant changes in the microstructure of alloy 230 at high temperatures.
AB - The biaxial thermal creep behavior of Inconel 617 and Haynes 230 at 850 and 950°C was investigated. Biaxial stresses were generated using the pressurized tube technique. The detailed creep deformation and fracture mechanism have been studied. Creep curves for both alloys showed that tertiary creep accounts for a greater portion of the materials' life, while secondary creep only accounts for a small portion. Fractographic examinations of the two alloys indicated that nucleation, growth, and coalescence of creep voids are the dominant micro-mechanisms for creep fracture. At 850°C, alloy 230 has better creep resistance than alloy 617. When subjected to the biaxial stress state, the creep rupture life of the two alloys was considerably reduced when compared to the results obtained by uniaxial tensile creep tests. The Monkman-Grant relation proves to be a promising method for estimating the long-term creep life for alloy 617, whereas alloy 230 does not follow the relation. This might be associated with the significant changes in the microstructure of alloy 230 at high temperatures.
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U2 - 10.1016/j.jnucmat.2013.12.016
DO - 10.1016/j.jnucmat.2013.12.016
M3 - Article
AN - SCOPUS:84892582004
SN - 0022-3115
VL - 447
SP - 28
EP - 37
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 1-3
ER -